ICMCS Seminar - Adsorption of complexes of bio(based) polycations and the biosurfactant rhamnolipid onto model
ICMCS Seminar - Adsorption of complexes of bio(based) polycations and the biosurfactant rhamnolipid onto model
- Event time: 4:00pm until 5:00pm
- Event date: 2nd June 2025
- Speaker: Mr Jörn Optatzi (TH Köln - University of Applied Sciences)
- Location: James Clerk Maxwell Building (JCMB) 2511 James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Event details
Title: Adsorption of complexes of bio(based) polycations and the biosurfactant rhamnolipid onto model
Abstract: Mixtures of cationically modified polymers and anionic surfactants are of great industrial interest and are present in products of our daily use. For example, soil release polymers in laundry detergents adsorb onto textiles to prevent resoiling. In shampoos, care polymers are used for conditioning effects. The interactions between conventional polycations and anionic surfactants, which are mostly made of fossil feedstock, are investigated intensively over the last decades.[1,2,3] In the context of climate change and its associated challenges, the imperative for the development of sustainable alternatives is paramount. The different properties of bio(based) polyelectrolytes and biosurfactants necessitate, however, a comprehensive investigation and understanding of their interactions. In this work, we studied the bulk as well as the interfacial properties of the bio(based) polyelectrolytes hydroxypropyl guar hydroxypropyltrimonium chloride and ε-Poly-L-Lysine and the biosurfactant rhamnolipid. Among other techniques, light-scattering based microrheology and quartz crystal microbalance with dissipation were used to probe the bulk and interfacial properties, respectively. It was found that the adsorption of the complexes could be enhanced by adjusting the polyelectrolyte-biosurfactant ratio close to the phase separation boundaries. This could, particularly in the case of guar-rhamnolipid complexes, be observed far from the theoretical charge-matching point.
References
[1] G. Nizzri, S. Magdassi, J. Schmidt, Y. Cohen, Y. Talmon, Langmuir 20, (2004), 4380–4385.
[2] F. Fernandez-Peña, E. Guzmán, C. Fernández-Pérez, I. Barba-Nieto, F. Ortega, F.
Leonforte, R. Rubio, G. Luengo, Polymers, 14(7), (2022), 1335.
[3] N. Khan, B. Brettmann, Polymers, (), (2018), 11(1), 51.
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About Condensed Matter lunchtime seminars
This is a weekly series of informal talks given primarily by members of the institute of condensed matter and complex systems, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..